Physicist Brian Greene dropped by The Late Show to explain to Stephen Colbert the exciting new scientific discovery of 'gravitational waves.'

A good explanation of what 'gravitational waves' are, how LIGO (the Laser Interferometer Gravitational Wave Observatory)
detected them and why they are important.
Brian Greene is also known for his book "The Elegant Universe" where he explains concepts from quantum physics such as the
"string theory" in layman’s terms.

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